"But can they get pregnant outside of marriage without the aid of a man? Not without expense and extraordinary medical treatment."
I assume the term "Nocturnal Emission" means nothing to you. Or does not exist in your universe.
And it is not unknown for a female to use guile or act facetiously simply to use a male as a 'doner' -and then dump him when her goal is accomplished.
As to the question of manipulative women...I agree. Some are. So, are you saying that it is impossible for a man to think more highly of himself so that he does not to engage in sex with a woman he is not married to?